Force pump



J. BINDERUP FORCE gum? June 24, 1930.

Filed Nov. 12, 1926 3 Sheets-Sheet l J. BINDERUP June 24, 1930.

FORCE PUMP Filed Nov. 12. 1926 3 Sheets-Sheet 2 June 24, 1930.

5 63*. as I I a Filed Nov..12. 1926 I BINDERUP FORGE PUMP 1 5 Sheets-Sheet 5 Y W 1T.)

v f "Other objects and advantages reside detail construction of the invention; I which description.

Patented June 24," i

4 JUL BINDERUP,"50 IE erive n; jcoLonAno'."

i f some I reins Application fil ed. fiovember 12 ,1' 1326. J seri no. i iaeso.

allow the control valves to remain open'fo'r substantially the full length of the stroke of-the pump plunger; Another object of the invention is to videja grease" piston vqhich ivill insure a positive seal andwhich willsnot force the grease through the plungerpacki'ng. 1

" -A further object of the invention is to provide an air piston inwhich the pressure of the air acts to positively sealthe piston to thecylin'der Walls;

-'- A still further object is to provide an intake check valve for the grease, which will be easily accessible; simple in construction, and'independent ofsprings. I in the is designed for simplicity; economy and efficiency. Thesewill "become more-apparent from the 7 following description.

In the following detailed descriptionof the invention reference is had to'the accompanying drawings Which form a part hereof.

Like numerals refer to like parts in all views of the-drawing and.throughoutthe In the: drawings: i

' Fig. 1 is'a side elevation "of theconiplete Fig. 2 is a vertical;section through the air valve box, taken on the.line 22, Fig. 1-.

Fig. 3 is a detail ie of the, valve rod support. v ji Figs. 4: and 5-together; form an enlarged vertical, longitudinal sectionthrough the pump; These figures arefcontinuations of.

each other. p e M I Fig. 6 is'afragmentary-plan- View of the aircylinderwith the valve box removed,

Fig. '7 is av vertic line 7-7-, Fig. 4:

al section take-n on. the i -Fig. 8 is a detail vieWof the grease piston. '7

The invention comprises" a supporting frame 10, which carriesat on'e end an opera'ting or air cylinder 11; closed by a cylins der head 39, and at theother side a grease cylinder 12. A piston" rod l8'rextends through the frame 10 :from'Within': the air cylinder 11 #into the" grease cylinder 12, throughsuitable p acking glands M; ".i

Within i Y Q ;the piston r o d i 13 terminates in a 'piston formedofiacentral disk 15' and two externaldi shed disks 16.. Betvveen the disks {15 and-"ltifcircular sheets 'of packing 17 are compressed by meansof a nut 19 which is threaded fon' the piston rod 13. The sheets" of: packing .17

are [turned"backward at the cylinder Walls over the edges' o'f the disks .16; i The .disks 1 l6 are drilled-With diagonal? holes'l'18.- As the airpressure'increases on one side =.of tfhe pistonit will flow through the holes/1'8: and

place pressure behind thel'packingsheet 17 at the'p'oints where it contacts; Withthe cylinder wall; Thislpressure serves -to tightly force the packing against the vtall and: seals the piston from leakage.

1 Within the grease cylinder 12;-the piston rod 13 is turned to a smalleifdiameter; as

extremity 2-1 for-anut 7 6.- Piston-rings 22 the {length 'of' the portion :20 so. thatatherrod ingtlie ringsw 'As the piston-rod moves against "the grease "pressurev the grease :yvill ibe forced through the perforations '24 lIltO pistonsrings, creating a pressure in back of the rings which i will '-'force them; .tlghtly against the piston Walls and'prevent grease from escaping along the piston rod..- [As.the piston" moves in 'the opposite direction,

away from the grease, the piston rings cwill imove to a position against theh'disk' 231and scrape grease" from the Wallsv 1n behind the f 9 sh'ownat; 20 and-terminates in-athreaded surroundith'e' portion 20 and are preyented from leaving the piston rod by a rdislr-23 in "Which" perforations 2 2- are formed. The

Width of, the piston ringsf 22 is: lessf'than may movea limited distance withoutamovthe"spaeebetween' theportion QOrand the f I 'rings and throughthe perforations 24 back into the cylinder. This construction prevents grease from working along the piston rod and being forced through the packing gland14.'

The'flow of the air to opposite sides of'the air piston is controlled by means of a slide valve 25 whichslides within a cylindrical valve box 26 attached to the top of the air cylinder 11. Access may be had to the valve box by removing a cap 27 which isthreaded into one extremity thereof. .A packing gland drical in contour to fit snugly within the cylindrical valve'box 26. To prevent it rotating within the valve box,-a squared shoulder 31 is. formed on the valve rod so as to engage a squared depression in the j'slide valve, it being held in place therein by means. of aslide valve nut 32. This construction prevents the slide valve from rotating on the valve rod. The outer extrem- 'ity of the valverodis slidably carried in a valve-rod support33, and is prevented from rotatingftherein by means ofa set screw 34,

.that projects'into a longitudinal groove 36 Fin the valve'rod. The set screw 34 may be 7 lock 'nutf35.

locked in position by means of a suitable :A passage-37.commu nicatesfrom a port 40in the valve box 26'through the wall of the cylinder 11- and the frame 10 to the piston rod side of the aircylinder. A simi- 1 lar passage 38 communicates from a-port 41 f in the valve box '26 through the .wallof the cylinder'l-l and the head 39 to'the head f end of thecylinder '11. v The passages 37 and 38cross each other within the wall of. the

V cylinder so that they terminate in the valve "box'26 oppositely from their terminations fin the cylinder.

Between the ports and-.41. an exhaust port 42 isplaced which communicates through an exhaust passage 43 to the ex 'terior'of the cylinder; The "action. of theslideuvalveon the ports 40, 41 and 42 is similar. to allslide valve actions employed in steam engines and the like,*and it is not believed necessary to describe its action here.

The amount of air. which may enter the cylinder-through the passage 37 or exhaust therethrough is controlled by meansof a needle valve 44 which acts as a throttlevalve by means of which the'operating speed of the pump may be set Air under pressure is fed intothe valve box through a supply 'pipe 45.

A rack 46 is arranged to slide in a track 47 in the frame 10 immediately over and parallel with the-piston rod 13. The rack '46 is moved by a pin; 48 whichis carried by the piston rod and arranged to engageprojections" 49 at the extremities of the rack. The pin 48 is tapered within the pistonrod and is held in place therein by a clamp nut 78. 'The pin 48 rides in the track 47 between theextremities of the rack and pre vents the piston rod 13fromrotating." A,

standard 50 is carried by therack which,

at its upper extremity, surrounds the valve rod 30 between stops 5l and 52 secured thereon; Y a

A pinion meshes with the rack 46 and is secured to a pinion shaft 55, carried in bearings 54 onthe frame 10. The pinion shaft 55 terminates in a lever 56 arranged to draw upon a spring'rod 57 wliichiterminates in" a piston 61 within a spring sleeve 59 pivoted to the frame 10 at 60. A'

coinpressionspring 58 surrounds the spring rod 57 within the spring sleeve 59. so-asto be compressed between the piston; 61- and the head of the spring sleeve. A rubber cushion 79 is placed in the bottom of the spring sleeve to receive, the return impact of the piston 61.

The operation of thisrhechanism;is as follows to the left, or in the directionyof the arrow; Fig. 4. It will move independently-until Assuming the piston rod 13 tobe traveling the pin 48 strikesthe projection 49 onlthe rack 46- (as shown in solid line, Fig. 4), and will then carry therack 46 wilh it. As the rack moves the lever 56 will raise,'compressing the spring 58 'untilflit reaches dead if center or position A, Fig. 4. The spring 58 will now expand and jerk the lever 56 .to the position B, Fig. 4. This causes the pinion 53 to quickly movethe rack-46st) ;v

that the standard 50 will engage the stop 51 and move the valve rod 30 andfthelslide valve 25 to the reverse position.- The .port

41-and the passage 38 Will'then be opened to the pressure in thevalve'box while the port .40 andthe passage 37 will'be opened,

to the exhaust port 42. This places the air pressure against the .head-ofthe-piston and allows air from the opposite side of thepi'stonto exhaust controlled by the needle valve,

44. The pistonnow moves to the-right or opposite to the, arrow of Fig.4, until the pin 48 engages the projection 49 at the opposite end of therack 46. Therack will now again move the lever 56 tothe dead center or A position from where it will be jerkedto the position G Fig, '4, thus causing" the valve mechanism to be again placed in the solid line position of Fig. 4. 7

The travel of the slide valve and its operating mechanism islimited by stops 62 and I 63 carried by the valve rod which engagesthe;

valve rod support 33 at the limits of' travel of the valve rod. The stops 51, 52, 6 2;and

63 eachprovided with cushions. 64. of

. ran

leather or vthe like, to absorb the impact caused by the action of the spring.

i an elbow 69 from the extremity of the grease cylinder 12. The elbow '69 is provided with a sleeve 70 which extends Within the grease cylinder 12 and forms a seat for a check valve 71, the stem of which is slidable in a support 72, within the elbow. The amount of opening of the valve 71 is limited by a stop screw 73 which is threaded through the cylinder 12 sufliciently far to be inthe path of travel of the valve 71. The cylinder 12 is enlarged, as shown at 74, immediately before the valve 71 to allow space vfor the grease to pass around the valve 71 when, it is in the open position, I

As the piston rod 13 withdraws from the cylinder 12, the valve 71' will open and allow the grease to fill the vacated'space.

As the piston rod moves into the cylinderv 12 the valve 7l-will be forced to its'seat and the grease will be forced from" the'cylinder through a grease discharge 75 .v

communicating motion from has been described and appended claims, without 7 the spirit of the invention.

' t 1. In a motor having While'a specific form of the improvement illustrated herein, it is desired to be understood that the same may be varied, within the scope of the departing from Having thus described the invention, what I claim and desire secured by Letters Patent is v r anoperating cylinder and a piston rod extending'from a piston Within saidc'ylinder; a valve box carried by said cylinder; a slide valve within said valve box adapted to control passages from said box to oppositeends of said cylinder; a valve rod extending from said valve box substantially parallel to said piston rod; a projection on said piston rod; means for said projection 1 to said valve rod, said means comprising a movable standard; stops on said valve rod adapted to be engaged by said standard; and means for causing sai'd'standard to be operated 'fromsaid projection, said'means' comprising contacts adapted to move with said standard and be engaged by said projection only at the extremities of its travel and a spring arranged to move said stand ard beyond theextremities of travel of said projection after the initial movement has been imparted by said projection.

2. In a motor having an operating cylintion of its der and a piston' rod extending from a *piston within said cylinder; a valve box car,-

ried by said cylinder; a slide valve within said valve box adaptedto-control passages y from said box to opposite ends of said cylinder; a valverrod extending from said valve box substantially parallel to said piston rod; a pin projecting from said piston rod; a

member arranged to slidesubstantially parallelwith said" piston rock-projections on said member adapted to be engaged by said pin when said piston approaches the limits it of its travel, said member remaining at rest until engaged bysaid pin; a standard carriedby said member; andstops on said valve rod adapted to be engaged by said standard,

a-spring arranged to move said member beyond the limit of travel of said pin; and

means for bringing said spring into action when said pinengages said member. V 3. In a motor having an operating cylinder anda piston rod extending from apiston within said cylinder; a valve box car'- ried by said cylinders; a slide valve within said valve box adapted to control passages from said box to'opposite ends of said cylinder; a valve rod extending from said valve box substantially parallelto said piston rod;

a pin projectingfrom said piston rod; a

rack arranged to slide substantially parallel- {with said piston rod; projections on said rack adapted to be engaged by said pin when said piston approaches the limits of its travel; a standard carried by said rack; stops on said valve rod adapted to be engaged by said standard; apinion arranged to mesh with said rack; a leveroperated from said pinion; and a spring arranged to resist the movement ofsaid'lever' for a por-' tion ofit's travel and assist itsmovement for another portion thereof so asto'cause said rack to have a more extended movement than said pin. l

4:. In a pump having an operating cylinder and a piston rod extending from apiston within sa d cylinder; a valve boxcarried by said cylinder; a slide valve within from said box to opposite ends of said'cylinder; a valve rod extending from said valve box substantially parallel to said piston said valve box adapted to control passages V rod; a pin projectingfrom said piston rod;

a rack arranged to slide substantially parallel with'said piston rod; projections on said rack adapted to be engaged, by said-pin when said piston approaches the'limits of its travel; a standard carried by said rack;

stops onsaid valve rod adapted "to be engaged'by said standard; a pinion arranged to mesh with said rack; a lever operated" from said pinion; a spring arranged to re sist the movement of said lever fora portravel and assist its movement for another portlon thereof so asto causesaid rack to have a more extended movement than said pin; a sle'eve enclosing said spring and pivoted at its'one extremity; ahead 1n v said sleeve ;7 and a spring rod terminating in a piston at itsone extremlty 'and secured to' said lever at its other extremity so as to compress said spring-between said piston and the head of sand sleeve.v a

5. A pressure operated reciprocating Inotor'coniprising. a snpporting frame, an" operatlngqcyhnder carried at onezend otsald iramej a p ston rod extenchng, from said operating cylinder throughsaid frame; a

slide valve arranged to control said operat-r mg cylinder;

a valve'rod' extending from said slide valveya traok earrled sby said i frame adjacent said piston rod; a rack a-re' rangedto slide on said track and operate saidvalve rod at predetermined times; a projection in said piston rod adapted to engage said rack at predetermined timesra pinion carried-by said frame in mesh with said rack and a spring arranged to be ,com 5 pressed by the motion, ofsaid pinion for a portion. of its said pinion for another portion of its travel.

In testimony whereof, I- affix my signature.

7 ,JUL BINDERUR.

travel and adapted to rotate. 

